You gotta slowly build yourself up.
But eating slowly over the day isn't bad. It's better for your metabolism. Eating once a day like Solara really isn't the best thing for your body

You're only going to slow your metabolism, put your body in starvation mode making it hold more calories then it needs.
I have read things to that effect before, which is why I'm not stressing about snacking. Eating large portions would just make me puke, my mind just can;t handle knowing that I have gorged in anyway, so I keep it simple.
I eat small things, like a couple of scrambled eggs with veg in it, or cheese and crackers and fruit.
If I do eat proper food I generally serve myself on a saucer size plate so that I feel comfortable with what I am eating.
My doctor said I could survive on 600 calories a day at the least, so not to panic if I don't manage anymore than that.
Berbs, when I was at my worst anorexic point, I wasn't eating anything for weeks on end, like I would have a small snack every two weeks or so, and the doctor threatened to hospitalize me if I didn't start putting on weight and said the only reason she hadn't already was 'cause I had a kid (I was also pregnant with my boy at the time but didn't know it and was so underweight that my BMI was less than that of some models who have died from anorexia at higher BMIs than what mine was at the time). What I did to start up my metabolism again and to make my stomach cope with eating again, was to drink a cup of sustagen by quarters throughout the day. After a week of that I upped it to 2 cups a day, then to 3. And then started eating small amounts several times a day. I got to the point where I was having dinner every day, small dinner, but dinner none-the-less, and snacks during the day. I had to make it all small as my body wasn't used to the food and every time I ate I felt like crying and hated myself for eating. I'm much better now, I still have weeks where all I will have is coffee when I'm really stressed, but I'm getting better, and gourging myself with tim tams is to me a victory, I won't apologize to anyone for eating as many tim tams as I like, as it's better than me eating nothing. I still don't eat breakfast most days, and many days I don't eat lunch neither, but I'm alot healthier than I once was and am eating way more than I ever have in the past.
Just saying, it is possible to get back one's appetite and it is possible to get your stomach to adjust to bigger amounts of food. Snacking is an awesome way to get there, I think it's the only healthy way for those who've been eating less too, as too much sugar hits whether from junk-food or plain carbohydrates and fruit isn't great for one's blood-sugar and pancreas or for the brain and when your body is used to less it's better to snack throughout the day rather than eat all at once once in a day.
I'm defintely past the worst of the anorexia. (for now since no triggers have occured to spiral me backwards)
Instead of 70 calories a day, I just make sure I eat 2-3 times a day, a light snack. With a few minor nibbles in between, like a handful of olives or 1-3 biscuits.

Same as you though, certain more stressed out periods can send me back to the coffee and beef jerky. But no matter how weird people think my food habits are I don't actually care now since I know I'm doing way way better.

I love that.